how to detect human moving using background subtraction

hello guys!!..

can anyone teach me how to detection human moving in matlab??

i detected the blobs in scene but i don't know how to detect the human among them

Thank alot...

p/s: sorry for my english!

It might help to think how you would describe a moving human, in terms of geometric shapes. Start with the scene as represented by a grid of pixels. A human generally is a tall rectangular mass of pixels.

The head is a smaller oval mass, at the top of the body. Face and hair are often different colors.

Arms are long rods, which pivot at the shoulder and elbow. Etc.

A moving human usually has moving legs. These are easier to spot when looking from the side.

The shapes can be picked out more easily if the background is a solid color, and different hue from the subject.

Software which can do this needs to be sophisticated. I picture it needing a long and complicated algorithm. There are companies which have done this with a measure of success. They need to charge money for their efforts. I do not think they will share their algorithm for free.